CN103107623A

CN103107623A - Electric machine

Info

Publication number: CN103107623A
Application number: CN201210394347XA
Authority: CN
Inventors: S.A.埃文斯
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2011-10-18
Filing date: 2012-10-17
Publication date: 2013-05-15
Also published as: DE102011084716A1

Abstract

The machine (401) has a rotor comprising rotor poles (107), and a stator (109) comprising stator teeth (111) that face the poles. Windings of three coils (113) are wound around the teeth, where the coils are divided into multiple coil groups. The coils in each group are arranged adjacent to each other. The coils are formed by a common winding wire, and the groups are connected in a star connection or a delta connection. A lead frame is formed with coil terminals, where electrical interconnections between the coils and the terminals are partially embedded in a resin layer of the frame.

Description

Motor

Technical field

The present invention relates to a kind of motor, particularly synchronous machine.

Background technology

Open source literature DE 10 2,009 002 928 A1 for example, perhaps open source literature DE 10 2,009 029 065 A1 disclose such motor.This motor generally includes rotatable supporting, and has the rotor and the stator with stator tooth of rotor pole, and coil is wound around around stator tooth with N the number of turn, and wherein N is natural number.

People wish to reduce the manufacturing expense of motor.

Summary of the invention

Therefore, task of the present invention is to provide a kind of motor that can simply make.

This task is accomplished by the content of claim 1.Some favourable schemes are themes of each dependent claims.

On the one hand, provide motor, particularly the motor of the preferred brushless of synchronous machine.Motor comprises rotor, and described rotor is rotatably mounted.Rotor has a plurality of rotor poles, and described rotor pole preferably consists of by permanent magnet.In addition, stator is set also, stator comprises a plurality of stator tooths, and wherein, these stator tooths are towards the rotor pole setting.Coil correspondingly, particularly a plurality of coils are wound around around stator tooth.That is to say, particularly the winding of coil is wound around around stator tooth.Wherein, these coils are divided into many tools coil groups, wherein, in coil groups at least three, three coils directly arrange adjacent to each other especially exactly.

That is to say, particularly the present invention includes a kind of design, be about to the coil that the stator tooth around stator is wound around and divide in groups, wherein, at least three coils that belong to a common coil groups directly arrange side by side or directly adjacent to each other.This particularly says, around directly arranged side by side, perhaps the stator tooth of direct setting adjacent one another are is wound around these three coils respectively.

According to its connotation of grouping of meaning of the present invention particularly, the coil of grouping forms a common circuit.Therefore these coil groups form respectively the circuit that is separated from each other thus.Usually must be series connection at a coil groups coil.A plurality of coil groups can be connected in parallel to each other.Particularly can say the subset of the coil of a coil groups (Untermengen) series connection.Particularly three coils that are set up in parallel are together in series.

By at least three coils in a coil groups are set up in parallel the manufacturing process that motor has been simplified in this measure widely.This is following generation.

To electrically contact common coil and particularly electrically contact with lead frame in order to produce." Lead frame ", perhaps technical term " Connection bord " are adopted in English specialty statement in this respect.Wherein, the winding overhang of coil is electrically connected to lead frame usually, for example by soldering, and perhaps rivet hot operation.Those coils that belong to a coil groups together must be electrically connected to each other usually.When the coil that is set up in parallel does not each other belong to same coil groups, each coil itself must and lead frame electrically contact, like this, each coil that just have oneself with the device that electrically contacts lead frame.But in this present invention's regulation, at least three coils of a coil groups are to be set up in parallel, and like this, at first the corresponding winding overhang of three coils can be electrically connected to, perhaps instead particularly also can use a shared winding wire, in order that this winding wire is wound around around three stator tooths.Then this jockey that shares or common winding wire and lead frame electrically contact.Therefore, compared to the prior art reduced widely the quantity that electrically contacts with lead frame necessity, this has reduced manufacturing expense widely.

A circular channel of the winding of the coil that the Windung(circle of meaning of the present invention) refers to especially.For example when using winding wire to the winding of coil, number of turns N-N is natural number-mean that this winding wire is wound around N time around stator tooth.The circle direction particularly represents the winding direction of winding wire, is for example namely to be wound around in the direction of the clock or counter clockwise.

According to a kind of form of implementation, each coil attach troops to a unit in phase winding or motor around and a phase.Can be for example the phase of motor winding mutually according to the present invention.Three phases for example are set.That is to say, particularly each coil phase in mutually in three of attaching troops to a unit.Those three coils that are set up in parallel that preferably also are divided into coil groups, particularly a coil groups in the coil of a common phase of attaching troops to a unit are attached troops to a unit in a phase.Therefore in an advantageous manner with having the quantity that out of phase coil has reduced the zone line between stator tooth.Usually there is certain risk in these in the zone, namely different may occurring short circuit corresponding between mutually owing to having.But because the quantity of such zone line has reduced according to the present invention, so reduced widely the probability of short circuit, this advantageously causes the motor of anti-the fault.Some zone lines particularly form by the stator slot that forms between single stator tooth like this.

Can stipulate according to a kind of form of implementation, lead frame has binding post mutually for each, and the coil that shares phase by binding post just can electrically contact.This particularly says, these coils are electrically connected to binding post, so advantageously enough makes mutually to be connected with binding post, in order that corresponding coil is attached troops to a unit in the phase phase.Can reduce widely corresponding contact expense by this measure.Binding post particularly can be designed to plug or clamp, and the cable that is connected accordingly that is used for phase can be inserted into this plug or be clamped into this clamp.When being arranged, can stipulate advantageously by a plurality of binding post that these binding posts can identical or differently design.

According to the arrangements of electric connection between a kind of form of implementation coil and binding post at least in part, particularly be embedded in resin bed fully or fully, wherein, resin bed is arranged on lead frame.This particularly says, lead frame has resin bed, and arrangements of electric connection particularly fully is embedded in this resin bed at least in part.Can preferably stipulate, the arrangements of electric connection between single coil also is embedded in resin.Resin bed particularly can be for black.Preferably also can stipulate, resin bed covers corresponding arrangements of electric connection.Arrange and can protect arrangements of electric connection by this, prevent outside machinery or electric impact, like this, the motor of corresponding construction also can use in rugged environment.Motor can move very reliably for especially firmly design.

Can stipulate in another form of implementation, lead frame has the corresponding coil connectors that is electrically connected to for coil, wherein, particularly can stipulate, coil connectors is connected with binding post by arrangements of electric connection.Usually this measure has produced the especially simply contact of coil.

Coil is connected connection with coil connectors for example can be by soldering or the formation of hot riveting operation.

Can form a kind of structure member of punching press according to a kind of form of implementation lead frame.This particularly says, this lead frame can be made by the punching press of preliminary working structure member.This way particularly has advantages of such, and namely lead frame can be simple especially, and also can produce in enormous quantities fast.

Can stipulate according to another form of implementation, lead frame has substantially suitable with the diameter of stator round-shaped of diameter.Advantageously can produce special compact structure by this measure.Particularly can stipulate, lead frame has the suitable shape of shape of fundamental sum stator.Preferably binding post surpasses the stator leading thread to protruding, can realize especially simply electrically contacting of binding post like this.

Some schemes of above-mentioned relevant lead frame should not be understood as a kind of restriction, and to be interpreted as be exemplary.Replace this lead frame ground also can use general Electical connector, realize electrically contacting of coil by these Electical connectors.

In a kind of form of implementation, can be used as mutually the star point circuit, perhaps be connected to each other as the Delta circuit.The Delta circuit also can be called delta network.Particularly in delta network, so due to the 3rd rank that are provided with in the electric current that three coils can avoid flowing in delta network, this can cause less torque ripple.In addition, also can reduce rotor loss, noise emissions and brake torque by this measure.In addition, also can simplify widely the control of motor by this measure.

According to a form of implementation instead coil have respectively opposite coiling direction.This particularly says, what follow after the coil with certain coiling direction is the coil that has with the coiling direction of this certain coiling opposite direction.As an example, and for three coils that are set up in parallel of this problem develop are described better, wherein, first and tertiary coil have identical coiling direction, second or middle coil have coiling direction with this coiling opposite direction.This coil in the middle of advantageously causing have electric current by the time form a kind of magnetic flux that has with the opposite polarity polarity of the magnetic flux that forms by the first and second coils when electric current is arranged.Corresponding magnetic flux is crosslinked just in time not to disappear, and so just can form torque.The below will explain this point.

Magnetic flux crosslinked particularly with magnetic flux and N, the product of coil number is directly proportional, and wherein, must just consider symbol or negative according to the coiling direction at this.The first coil is for example because the sense of current-it is produced-had the magnetic flux M that radially outward points to by the coiling direction.Then crosslinkedly at this magnetic flux be:

F _{1, coil}=(+M) * (+N)

The second coil is because the sense of current has magnetic flux-M, and this magnetic inwardly points to.Then magnetic flux is crosslinked is:

F _{2, coil}=(M) * (N)=M*N=F _{1, coil}

Calculate similarly tertiary coil.Therefore, these three corresponding magnetic fluxs are crosslinked is identical, and does not cancel out each other.

Be applicable to the coil of any amount like the above-mentioned relevant compute classes of three coils, therefore the coiling direction of alternation is set, and advantageously corresponding generation is identical, and the magnetic flux that can not cancel out each other is crosslinked.

Three coils that preferably form a coil groups have the coiling direction of alternation.

According to another form of implementation, at least three coils form by a common winding conducting wire.This particularly says, uses a kind of winding conducting wire, comes to be wound around three coils around three adjacent stator tooths.Can advantageously reduce further manufacturing expense by this measure, because be connected to each other at this this three coils, and just the end of winding conducting wire must contact with lead frame.Therefore advantageously reduced further the quantity that contacts with lead frame.

According to another form of implementation, motor comprises 18 stator tooths and six coil groups that have respectively three coils that directly are set up in parallel.Three of a coil groups coils phase in mutually in three of a winding of attaching troops to a unit preferably.This particularly says, each coil groups is attached troops to a unit in a phase.First, second, and third phase preferably is set, wherein, attaches troops to a unit respectively in first, second, and third phase for each two in six coil groups.

Attach troops to a unit according to another form of implementation and consist of for alternation mutually with respect to this in the coil groups of corresponding phase.This particularly says, is another coil groups in the back of the coil groups with a phasing, and this another coil groups is attached troops to a unit in the phase different from a phasing.Namely say especially, three mutually in, at first three coils that are set up in parallel attaching troops to a unit in the first coil groups of first-phase are set.Then three coils that are set up in parallel of attaching troops to a unit in the second coil groups of second-phase then are set.Then three coils that are set up in parallel attaching troops to a unit in the tertiary coil group of first-phase are set again.Then three coils that are set up in parallel attaching troops to a unit in the 4th coil groups of first-phase are set.Then three coils that are set up in parallel attaching troops to a unit in the 5th coil groups of second-phase are set.Then three coils that are set up in parallel attaching troops to a unit in the 6th coil groups of third phase are set.Therefore advantageously only form 6 stator slots having between out of phase two coils.

Description of drawings

The below is by preferred embodiment, and with reference to accompanying drawing, the present invention is described in more details.These accompanying drawings are:

Fig. 1: have the sectional view of motor of the coil prior art of winding, the coil phase in mutually in three of attaching troops to a unit.

The sectional view of the motor of Fig. 2: Fig. 1 wherein, additionally illustrates the coil of the winding of another two-phase phase.

The sketch that electrically contacts of the coil of the motor of Fig. 3: Fig. 1.

Fig. 4: the sectional view according to motor of the present invention with in three coil of the winding of a phase in mutually of attaching troops to a unit.

Fig. 5: the sectional view of Fig. 4 motor wherein, additionally illustrates the coil of the winding of another two phases.

The coil of the motor of Fig. 6: Fig. 5 connects sketch.

Another of the coil of the motor of Fig. 7: Fig. 5 connects sketch.

The Y-connection of the coil groups of the motor of Fig. 8: Fig. 5.

The triangle of the coil groups of the motor of Fig. 9: Fig. 5 connects.

The coil of the motor of Figure 10: Fig. 5 electrically contact sketch.

Figure 11: in prior art and motor of the present invention by the single comparison about the polar plot of the motor force on the first rank that forms mutually.

Figure 12: in prior art and motor of the present invention by the single comparison about the polar plot of the motor force on the 3rd rank that forms mutually.

Figure 13: according to the curve chart of the torque at rotor angle.

Figure 14: according to motor force and bar chart harmonic amplitude of the phase on harmonious rank.

Below identical feature use identical Reference numeral.

Embodiment

Fig. 1 illustrates the sectional view of the motor 101 of prior art.This motor 101 is designed to synchronous machine.It comprises rotor 103, and described rotor is rotatably by axle 105 supportings.Rotor 103 comprises 14 rotor poles 107, and described rotor pole forms by permanent magnet 108.

Synchronous machine 101 comprises stator 109 in addition, and described stator has 18 stator tooths 111.Wherein, these stator tooths 111 are radially inwardly directed towards axle 105 directions, and arrange towards rotor pole 107.These 18 stator tooths 111 from 1 to 18 are numbered one by one, wherein, will number accordingly the outside that is marked at stator 109 for convenience's sake.These stator tooths 111 have in their end towards rotor pole 107 zone 112 of widening respectively, and this zone of widening also can be called the stator tooth boots.

Coil 113 respectively around first, second, the 6th, the tenth, the 11 and the 15 stator tooth is wound around.The coiling direction of coil 113 represents by two illustrated parts with

Reference numeral

115 and 117, and wherein, the parts with Reference numeral 117 represent, the winding of coil 113 slips in low degree.The winding of components list timberline circle 113 with Reference numeral 115 from paper plane out.

The coil 113 that is drawn in Fig. 1 is attached troops to a unit in a phase of three phase windings, and is divided into two coil groups, first group: be positioned at the coil of

stator tooth position

1,2,6, second group: the coil on stator tooth position, ground,

position

10,11,15.

Stator 109 comprises respectively that by a plurality of the stator segment 125 of a stator tooth 111 forms, and wherein, these stator segments 125 for example are connected to each other on the Background Region 127 that deviates from rotor pole 107 by Laser Welding.

Fig. 2 illustrates the synchronous machine 101 of Fig. 1, and wherein, at this, other coils 113 are wound around around corresponding stator tooth 111 now.At this wherein, a coil 113 is wound around around a stator tooth 111 respectively.Similar Fig. 1 ground six coils 113 respectively is grouped into a shared phase, and correspondingly attaches troops to a unit in two other phase of winding.Drawn a legend on the right of motor 101 in order to distinguish better in Fig. 2, this legend illustrates the symbol 119,121 and 123 of the coil 113 of same phase, wherein, the first-phase of symbol 119 expression windings, this phase also can be called phase A.Symbol 121 expression coils 113, it is attached troops to a unit in the second-phase of winding, and wherein, second-phase also can be called phase B.Correspondingly symbol 123 represents coils 113, and this coil is attached troops to a unit in the third phase of winding, and this also can be called phase C mutually.

Form six coil groups, these coil groups have respectively three coils 113, and wherein, these three coils are attached troops to a unit in a common phase.At this wherein, maximum two coils 113 of a shared phase and a shared coil groups arrange side by side or adjacent to each other.12 stator slots 201 are arranged in motor 101, the space between stator tooth 111 namely, their form the boundary that has between out of phase two coils.This boundary is for example the stator slot 201 between two and three stator tooths 111.That is to say the possibility that exists short circuit in 12 zones between corresponding phase.

Fig. 3 sketch illustrates, and where 18 coils 113 of the motor 101 in Fig. 1 and Fig. 2 are as electrically contacting with unshowned lead frame.At this wherein, Reference numeral 301 sketches represent the corresponding winding conducting wire of 18 coils 113.Corresponding winding conducting wire is in this from 1 to 24 numbering one by one.At this, this numbering represents with Reference numeral 303.That is to say that 24 single make contacts must be arranged on the electric lead framework, to electrically contact 18 coils.

Fig. 4 illustrates according to motor 401 of the present invention, and this motor designs as synchronous machine.Synchronous machine 101 similar designs of the basic and Fig. 1 of this synchronous machine 401 its structure except the layout of coil.Please refer in this respect relevant description.In addition, represent identical feature for identical Reference numeral for the purpose of understanding.

Particularly be with the difference of the synchronous machine 101 of prior art, in synchronous machine 401 according to the present invention, three coils 113 that are used for the coil groups of A phase are set up in parallel by three layouts respectively.That is to say, three coils of the coil groups of phase A are set up in parallel.Three coils 113 of other of the second coil groups of A phase also are set up in parallel.For example can stipulate, compare with the motor 101 of Fig. 1 and Fig. 2, the coil 113 in the there on stator tooth 6 is moved on stator tooth 9, and is moved on stator tooth 18 at the there of the coil 113 on stator tooth 15.

Fig. 5 illustrates the synchronous machine 401 of Fig. 4, and it has the coil 113 of other windings, and described these coils are attached troops to a unit in two other phase of winding, phase B and C.For the sake of clarity, single parts are not all indicated Reference numeral.In order to distinguish better the single coil 113 of three phase A, B and C, be provided with the legend that is similar to Fig. 2 on the right of synchronous machine 401.

Each in three phase A, B and C has 6 coils 113 mutually, and wherein, three coils in these six coils are wound around around the stator tooth 111 of setting adjacent one another are respectively.

What at this wherein, follow after three coils of a common phase is another three coils of the phase different from it.Quantity as the stator slot 201 of the boundary between different phases is only 6.Therefore advantageously reduced widely the probability of phase short circuit by a little measures.

Also be clearly shown that especially as Fig. 5, corresponding coil has the coiling direction of alternation in corresponding stator tooth position 1 to 18.This particularly says, the coil in

stator tooth position

1,3,5,7,9,11,13,15 and 17 has a kind of coiling direction, this coiling direction and the coiling opposite direction that is positioned at the coil on

stator tooth position

2,4,6,8,10,12,14,16 and 18.

Fig. 6 illustrates the connection sketch of coil 113 of phase homophase of the motor 401 of Fig. 5.The corresponding coil of a coil groups is connected.A1 and A2, B1 and B2 and C1 and C2 represent each electric connection of series circuit, and wherein, A, B relate to three mutually with C.Numbering 1 to 18 in three series circuits relates to corresponding stator tooth position.

Phase A comprises two coil groups, and these two coil groups comprise the locational coil of stator tooth, and first group comprises

coil

18,1,2; Second group comprises

coil

9,10 and 11.

Phase B comprises two coil groups, and these two winding wires comprise the locational coil of stator tooth, and first group comprises that

coil

6,7,8, the second groups comprise

coil

15,16 and 17.

Phase C comprises two coil groups, and these two coil groups comprise the locational coil of stator tooth, and first group comprises that

coil

3,4,5, the second groups comprise

coil

12,13 and 14.

The point that the coil side draws represents at the accompanying drawing of the drawings attached mark 115 of this and front similarly because the winding of this corresponding coil in position from paper plane out, therefore shown the coiling direction of coil windings.

Coil in this position of stator " X " also can be called " X " coil for simplicity, wherein X is equivalent to corresponding numbering.

Fig. 7 illustrates the sketch of another connection of coil of same phase of the motor 401 of Fig. 5.Therefore used as Reference numeral identical in Fig. 6, can be with reference to relevant description.Three coil series connection of each of coil groups, wherein, two series circuits, namely two coil groups are in parallel between corresponding joint A1, A2, B1, B2 and C1, C2 again.

Similar Fig. 6 ground forms two coil groups of corresponding phase A, B and C.

Form a coil groups at

phase A coil

18,1 and 2.

Coil

9,10 and 11 forms another coil groups.These two coil groups are in parallel between joint A1 and A2.

Form a coil groups at

phase B coil

6,7 and 8.

Coil

15,16 and 17 forms another coil groups.These two coil groups are in parallel between joint B1 and B2.

Form a coil groups at

phase C coil

3,4 and 5.

Coil

12,13 and 14 forms another coil groups.These two coil groups are in parallel between joint C1 and C2.

That is to say, normally each three of coil groups coil series connection that are set up in parallel, wherein, then, these two series circuits are connected in parallel to each other (Fig. 7), and (Fig. 6) perhaps is one another in series.

Particularly can stipulate, compare with coil layout shown in Figure 6 the number of windings that coil has twice in layout shown in Figure 7.

Fig. 8 sketch illustrates, for the star circuit that forms three phase A, B and C mutually the corresponding joint of A, B and C be as where connected to one another.

Fig. 9 sketch illustrates, for the delta network that forms three phase A, B and C mutually the corresponding joint of A, B and C be as where connected to one another.

Figure 10 is similar to Fig. 3 ground sketch and illustrates, and where 18 coils 113 of the motor 401 in Fig. 4 and Fig. 5 are as electrically contacting with unshowned lead frame.At this wherein, Reference numeral 1001 sketches represent the corresponding winding conducting wire of the coil of phase A.Reference numeral 1003 sketches represent the corresponding winding conducting wire of the coil of phase C.Reference numeral 1005 sketches represent the corresponding winding conducting wire of the coil of phase B.Be numbered to 12 with 1 in this corresponding winding conducting wire end.At this, numbering also represents with Reference numeral 303.That is to say, need to have 12 single electrical contacts in order to electrically contact 18 coils on the electric lead framework.Therefore, compare with published motor 101 in Fig. 1 and Fig. 2 and reduced widely manufacturing expense.

Figure 11 be illustrated according to prior art (left side polar plot) with according to being used in the motor of the present invention's (the right polar plot) by the single electric power that forms mutually (EMK), namely relate to the first rank, namely the comparison of the polar plot of the single EMK vector of basic phase.Due to the change in location of two coils of each phase in three layouts according to the present invention, so the winding fauna of basic wave is counted K _d1From the 0.960(prior art) drop to 0.844(the present invention) (reducing 12%).Average torque when in other words, use is of the present invention when phase current is identical is less by 12% than prior art.Preferably use higher phase current in motor according to the present invention, and/or the length of regulation increase electricity, with the less winding region coefficient of balance.

Figure 12 illustrates the third harmonic EMK vector mutually that discloses motor (left side) and the motor (the right) according to the present invention.Due to the change in location according to two coils of each phase of pressing three layouts of the present invention, so the winding fauna of third harmonic is counted K _d3From the 0.667(prior art) be reduced to 0(the present invention).This is particularly advantageous when three phase windings are connected with delta network, because the electric current that flows in triangle-this electric current trigger-is interrupted by the third harmonic EMK of phase.Usually use delta network at automotive field more, can use thinner wire because compare it with star circuit, this wire can more easily be wound around, and the activity coefficient that causes winding the line is higher.

By interrupt electric current in delta network can avoid copper loss (/ ^2*The R-loss) the reducing and produce braking moment of raising, electric efficiency, they are to produce by the electric current that flows through.The second, also can avoid other negative effect of in delta network current flowing, for example the difficulty of the raising of the raising of the raising of rotor loss, torque ripple, noise or discharging and Electric Machine Control aspect.

Figure 13 is illustrated in the curve of the torque of every unit (P.E) on the rotor angle of two pole spans (360/7o).The curve of the Reference numeral 1301 published motors of expression.Reference numeral 1303 expressions are according to the curve of motor of the present invention.At this wherein, curve 1303 is once to curve 1301 standardization.As can be seen from Figure, average torque reduces 12% in motor according to the present invention, yet compared with prior art reduces 21% according to the torque ripple of motor of the present invention.In addition, note also that at this, at the curve shown in Figure 13, also have other to affect the factor of torque, the electric current that for example flows through in delta network is not potentially paid attention to, and therefore, torque ripple of the prior art is much taller than shown in Figure 13 possibly.

Figure 14 illustrates the amplitude image of the harmonic wave of EMK mutually in published motor (bar chart with Reference numeral 1401) and motor according to the present invention (bar chart with Reference numeral 1403).This amplitude is standardized by the fundamental oscillation of published motor.Figure 14 illustrates compared with prior art that fundamental oscillation has reduced 12% in motor according to the present invention, and has eliminated the third high subharmonic fully.

Such scheme should not be confined to have the synchronous machine of the three-phase of 18 rotor tooths and 14 rotor poles.Also can stipulate more than or be less than 18 stator tooths, and/or more than or be less than 14 rotor poles.

Generally speaking, the present invention has particularly advised a kind of new winding construction of three layouts of coil of three groupings.By this structure decrease the quantity of the jockey between winding and lead frame, and reduced the quantity of stator slot, described stator slot forms the boundary between out of phase coil, so be to arrange face-to-face between this in this out of phase coil sides, and can eliminate the third harmonic in mutually at EMK by this structure, can advantageously eliminate by this measure the third harmonic electric current that flows in delta network, when winding has delta network.

Claims

1. motor (401) has:

The rotor of-rotatable supporting (103), it has a plurality of rotor poles (107)

-stator (109), it has a plurality of stator tooths (111) that arrange towards rotor pole (107), and the circle of coil (113) is wound around around described stator tooth respectively,

-wherein, coil (113) is divided into a plurality of coil groups,

It is characterized in that,

-at least three coils (113) directly arrange adjacent to each other in a coil groups.

2. according to motor claimed in claim 1 (401), wherein, described at least three coils are attached troops to a unit in a phase.

3. according to the described motor of claim 1 or 2 (401), wherein, described at least three coils (113) are to form by a shared winding conducting wire.

4. according to the described motor of any one in aforementioned claim (401), wherein, a plurality of coil groups are connected to each other with star circuit or delta network.

5. according to the described motor of any one in aforementioned claim (401), wherein, coil (113) alternation ground respectively has opposite coiling direction.

6. according to the described motor of any one in aforementioned claim (401), wherein, for electrically contacting of coil (113), lead frame has coil connectors, and coil electrically contacts on coil connectors.

7. according to claim 6 and motor claimed in claim 2 (401), wherein, lead frame has the binding post for phase, and coil connectors is connected with binding post by corresponding arrangements of electric connection.

8. according to motor claimed in claim 7 (401), wherein, the respective electrical jockey between coil (113) and corresponding binding post is embedded in the resin bed of lead frame at least in part.

9. according to the described motor of any one (401) in the aforementioned right of quoting claim 2, wherein, 18 stator tooths (111) and six coil groups are comprised of the coil (113) of 3 direct settings adjacent one another are respectively, these coils are attached troops to a unit respectively in a phase, set mutually each coil groups thereby give one.

10. according to motor claimed in claim 9 (401), wherein, first, second, and third phase is set, and wherein, gives respectively first, second, and third two coil groups that respectively set mutually in six coil groups.

11. according to the described motor of claim 9 or 10 (401), wherein, distribute to the coil groups of corresponding phase about being mutually alternation formation.